一、DIV 和 SPAN 标记的区别
DIV 和 SPAN 元素最大的特点是默认都没有对元素内的对象进行任何格式化渲染。主要用于应用样
式表。两者最明显的区别在于DIV是块元素,而SPAN是行内元素(也译作内嵌元素)。
具体步骤:
1.所谓块元素,是以另起一行开始渲染的元素,行内元素则不需另起一行,测试一下下面的代
码你会有更形象的理解:
测试<span>紧跟前面的"测试"显示</span><div>这里会另起一行显示,还可以有其他标记
</div>
2.块元素和行内元素也不是一成不变的,通过定义CSS的display属性值可以互相转化,如:
测试<div style="display:inline">紧跟前面的"测试"显示</div><span style="display:block">
这里会另起一行显示</span>
提示:如果不对DIV元素定义任何CSS属性,其显示效果将行将于P元素。
二、盒子模型
盒子模型的组成部分:content (内容)、padding (间隙)、border(边框)、margin(间隔)。如图所示:
打个比方:相框,或者说是盒子,都有一些参数:比如相框中相片的所占空间(content)、相片
与相框的距离
(padding)、相框本身的宽度(border)、墙上两个相框之间的距离(margin).这下大家应该比较熟悉了
吧!!
小结一下:盒子模型的的高度(即相框模型的宽度)=content+padding+border+margin;
这几个参数可是说是“盒子模型”的基本属性名,我们可以通过css技术给这些属性定义不同的属性
值,就可以达到丰富
的效果了!
content作为网页内容,是由height、width等属性值对内容单独定义的。作为框架部分,下面列举
padding、border、
margin的部分常用属性,以做参考:
padding padding-Bottom padding-left padding-right padding-Top
border border-bottom border-bottom-color border-bottom-style border-bottom-
width 等等
margin margin-bottom margin-left margin-right margin-top
CSS盒子模型结构的实例剖析
网页“盒子模型”代码如下:
/p>
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-
transitional.dtd">
Meaning: Regarding the width of elements and the calculation of the parallel spacing between elements, everyone must pay attention to it when laying out web pages.
Note: 1. Because different browsers have different support for CSS, in general, the spacing or distance between two elements is not the sum of the margins of the two elements, but the sum of the margins of the two elements. It is to take the larger margin value! 2. When margin is set to a negative number, the block set to a negative number will move in the opposite direction, or even cover other
blocks.
1. Float positioning floats left and right.
2. Clear floats
3. Position positioning
Position positioning is the same as float, and it is also a very important concept in CSS layout. Position literally means the position of the specified block
, that is, where the block is relative to its parent block and where it should be relative to itself.
) and fixed (fixed). Among them, static is the default value, which means that the block remains where it should be, that is, this value does not have any
effect of movement. Let's first introduce absolute, which represents absolute position.
4. Automatically select CSS style code

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